Multichannel telegraph printer



Jan. 1, 1935. R. F. DIRKES ET AL 1,986,768

MULTICHANNEL TELEGRAPH PRINTER Filed Dec. 15, 1952' 5 Sheets-Sheet 1 INVENTORS R. F. DIRKES R. WENTWORTH w m AT ORN Y Jgn. 1, 1935. R. FIDIRKES ET AL I MULTICHANNEL TELEGRAPH PRINTER Filed Dec. '13, 1932 5 Sheets-Sheet 2 R. WENTWORTH 0 Jan. 1, 1935. R. F. DIRKES ETAL MULTICHANNEL TELEGRAPH PRINTER 5 Sheets-Sheet 3 Filed Dec. 15, 1932 mmFzEm $225.0 m

a (NM INVENTORS R. F. DIRKES R WENTWQRTH Jan. 1, 1935. R F, QKES T vAL 1,986,768

MULTICHANNEL TELEGRAPH PRINTER Filed Dec. 13, 1952 5 Sheets-Sheet 4 INVENTO'RS R. F. DIRKES BY R. WENTWORTH Jan. 1, 1935. R. F. DIRKES ET AL MULT ICHANNEL TELEGRAPH PRINTER 5 Sheets-Sheet 5 Filed Dec. 15, 1932- INVENTOR R. F. DIRKES R. WENTWORTH ATTO NEY Patented Jan. 1, l935 --This nvention relates to a telegraph printer and; more particularly-to a printer adapted to ticn nr hereinafter appe r.

he operated falternately with another printer ession with a plurality of other printsingle line.;"" {5 artfstopprin s as heretoforeemployed e been foprated "on single channel tele? 'ph system, theprinter operation being started upon transmission of the; first :or start pt lseof a character code signal and being stopped after the last selecting impulse of i the group. 'ifhis reqniresfasepaijate line for each printer a .w: a i y lfjOn e time objects or he p e nt me e is'to provide astart-stop printer'which may'be iised in a two or more channel system in whi'ch over oneof thechan each printer is controlled Another Q bjeet is to providefa transmitting s'y em arranged tofcontrol a plurality cremest printersin succession{overa'singleline Another, object is to enable" a plurality of single line.

H "still ffi rther'object is tdeffecteconomy 1m mime-x Other objects and ad ntages 6: the invm I accordance with .the presentinvention we employ the start-stop'prin'ciple of 'synchronism, a single start impulse and a single rest impulse b n utiliz d to on l h e b b l a P ty ofjprintersf operating one alt atime. In ither words, between each, start: and ,rest im poise a plurality of character code signal groups are ansmittedQ each character code groupi lie in "recorded upon'ga "separateprinter as-in org iners? mult lex t m T- nte ti i scribed "hereinafter connection thgthe re eratioriifof two printers alternately but of course any des d number jof printers may e so oper n uecessionlimited only by the degree ti peed?regulationpbtainahler 130m printers present] instance are conditioned for operation-npon'reception of thestart impulse, one printerlheing effective to select the first charactencode' group and beinguninfiu'enced by the sncceedingcharacter code groupand thesecond printer b'eing ineffective to; select until the sec- 0nd characteri eodei grou'p is receiveds' Both printers "come to rest during, the rest impulse. For; convenience, the firstprinter to; operate will heitermedthe; A channel iprinter andjthe second r to operate will be. termed the B channel, printer.

@1111 order that the invention may be/more fully z 986,768" U WH E EGRhPHPRIN IQE I Wentworth, Verona, N,' "mf -n ts to Ihe h A Western Union Tglegra h c pa N Y k, h h 1 N. Y., a corporation f Ngwnlfdgk. I

a a 1 Application December 13, 19 serialzN'ofififl ????53-1).

fmr l'e'gz, printers to he'operat'ed selectively over a channel signals;

the indivi'dualfunctions the Y c Thelselectingsunit: comprises the driving understood; referencewill he Panyi'ne drawings in vvhi'c'h i had to the bodying'our invention;

1i Figure '2" is an elevation of the selecting "cam shaft showing [the cliannehcontrolling mecha nism associated therew'ith' yFiguIe K-is'an end view partly n -section, of theiprinfejg; i .11 .n J. Figurei'f iis a sectionahview of the se1ector and "channel controlling shaft assemblies takenm' the line 4- 46r r iure 3i T Figure 5 is a sectional view on the line;5--"-'5 of'Figure 2, showing= the mechanism "forreleasing'the"operating bam ofthe printer; a

flutter lever Figure" 6 is a 'deta'iled view "of the and fiutt'ercam K Figure "71s "a 'se'ction'al" view -also 't alzzen approximately on th line 5'- -5-of Figure 2 showing the "rest position 'of the -channel controlling F'igi refB i' s 'a"s imilar-sectioh showing the po; sitionof the'Aprinter' -ohanneI controlling mechanism during the p'erio'd of} reception of the Fi re" his a sideelevation of aprinter em Figure Q' is-'a similar section shew'mg the channel controlling "mechanism of the B channel printer in it's normal 'rest positionffi Figure 10 isasimilar 'secti'on of' theB'chan-J nel printer mechanism shcivving "tlie"position thereof "during theweception of th'e A channel signals}; Fignr e ll is a diagram showing the' timing of *a e izwC an:

nel printers; a r a. I

"Figure 12 is a wiring diagramof a transmit ting and receiving system' embodying the inventioniaand r channel fc'ontr'ol-"is": eifcte'dv' entirely wby the selectingcam shafta "fl' w i i i i Referring to i flFig'ure 1, the printer includes a constantlyflrunning motor 10: which, through a pinion 11, drives a gear 12 associated with the selecting unit;igenerally' indicated' at 13,l -fl.nd a gearl4 connected toaeawtype wheel shaft 15 through a friction clut'chwlfii u J i gear 12' rigidly securedto shaft 17, extending through bearings 18 andl9, (see Figure"4);-; Mounted upon the shaft fQl relative rotation thereon; is an'operating cam-'21, a ear- 22 and ;a selector camtdrum 23.-; Theselector cam drum;v arranged to; be driven from the shaft 17 by a friction c utc 24-; -,t1.1.e@ee ,2%1is d iven rom 'to effect engagement of the ratchet clutch.

The friction clutch 24 comprises a pair of spaced friction disks 28, '29, betweenwhich is loosely moj nted a clutch driven disk 31 ,for:re1a'- tive rotation? The'fr'iction' disks" 28," 29"are pressed into engagement with the driven disk 31 v scribed. This mechanism is shown in Figures by a spring washer 32.

Secured to the rear end of the] cam'drum 23 is an L shaped stop arm 33, (Figure having its free end extending through a slot-34 in the periphery of the driven"clutch disk, 31." The end of the arm 33 normally engages a fixedabut ment 35 (Figure 2) which retains the cam drum and driven disk 31 against-rotation under the drag of the friction disks 28 and 29. v H a Theselector cam drum consists of a hollow cylinder having'ztwel-ve cams 36 projecting from its outer surface. These cams are arranged in two spiral'rows; SiXfgOf, the cams forming one spiral row being marking; cams and the other six, forming thessecond spiral row, displaced 180 degrees from the first row, being spacing cams.

Secured to the front of theselecting cam drum isafcrimped disk or; flutter cam 37 having fourteen crimps or cam faces, seven of which project rearward andsevenifrontward. The flutter cam revolves with the drum and passes between the fcgrked arm 38 of a lever;,39j(Figure 6), pivoted a v ,I y A Pivoted at thesame point is, a;cam drum return lever 42,;the right. end .43mi vwhich bears underthe action of aspiral'jspring 44 against an annular plane surface 45 on thebackf of the fluttercamtadjacent'thehubythereof; ,The selector cam is mounted so as to slide back-andjorward ona sleeve. 46 on the shaft 1'7, the spring v44 serving to move itwto theright against the front-stop 4'7, Consequently if the forked end of the flutter lever is held stationary as the flutter cam'revolves'; it causes the drum to,

move backward and forward and if. the flutter lever is left free to'rock on its pivot, the cam returnjlever 42 retains the'selector drum to the and forward as it revolves.

right, the; flutter lever 39 rocking idly on its pivot as thefluttrTcam rotates.- J- V Thelong arm 4 8;of thefiutter cam projects tothe rear and is; of, such length that when the upturned end 49 of the armature extension 51, of the selectingmagnet 52,-is-in its marking or right hand position it willengagethe end'of the flutter lever, as shown in Figure 6, and thus prevent-p the lever fromrocking clockwise; In this, position, the selector icam moves backward However, when the rmature 51 is-in itsjspacing or left hand: position,.-itj clears the endofithe flutter lever permitting the same to rock idly under the action of the flutter. cam, theselector drum being retained infltdlfight hand, position by the cam return The start signalwhichprecedesfeach group 'of character signals is of spacing polarity and upon receipt thereof the armature 51 is'moved to the left away from the end of the flutter lever 39, thereby permitting the same to rock 4, 7 and 8. 'A shaft 53 is mounted in a bearing 54 carried by a plate 55 rigidly secured to the frame of the machine in any desired manner. he shaft 53 has on one end a gear 56 keyed thereto and meshing with the gear 22. A cam 57 is formed on the opposite end of shaft 53. Shaft 53 is normally held against rotation by a stop arm 58, pivoted at 59, on the plate 55.

' 'The'left hand end of the stop arm 58 (Figure 7) engages a stop lug 60 on the cam shaft-when the selecting cam drum 23 is at rest. The arm 58yis heldin engagement with the lug 60 by the raised portion of the cam disk 31 which engages a roller 61 carried on the right hand end .ofthe arm 58. The stop arm isnormally urged out of Y engagement with the lug 60 by a spring 62. The cam 57 is provided with a single projection 63 disposed approximately 180 degrees from the stop lug. 60. I

auxiliary or false stop arm 64, pivoted to the plate 55 at point 65, has a raised portion 66 extending into the path of the cam projection 63, as it revolves ina clockwise direction. A spring-6'7 retains the lever 64 in contact withthe face of the cam. The opposite end 68 of -;lever 64 normally extends into the upon thereception of the start impulse preceding a character group, stop arm 33 is released from the stop 35 andthe disk 31 and the cam drum 23 are permitted to rotate counterclockwise. As the disk 31 starts to rotate the drop therein comes opposite the roller 61 of the arm 58 permitting this arm to tripthe cam 57 for one revolution. The cam 57 vis geared to make halfa revolution for each revolution of the cam d 3 g I .The disk 31 and cam drum 23 revolve in substantial synchronism with the succeeding first or A channel code signals so that as each code impulse is received by the selecting magnet 52, each succeeding pair of cams 36 is brought into selecting; position. If the impulse is spacing the drumwill rest against its right hand stop at the time thefimpulse is received and if marking-.it will Test against its left hand stop.

,,Disposed along the selecting cam drum are six selecting levers '71 pivoted at 72 and having two spaced arms 73 and'74', the former being disposed above thecam drum and the latter be-' low the cam drum. The ends of these arms are oifset with respect to each other, the lower or markingarmbeing offset towards the back and the upper or spacing arm being offset towards the front. This is gdone so that when the marking cams line .upwith the marking arms the spacingcams will pass to the rear of the spacing arms and when-"the spacing cams are in line with the spacing arms, the marking cams will pass to the front 'of the marking arms.

IThe marking cams are the seriesof six. cams r g to issues "located ispirally around thedrum 23, the numftrn'l'heztransferllevers areraised through the acber one-"cam;.?when*theidi-um 23 is at rest, be ingwthearearmost cam on the underneath side or :"the :nrzum, adapted to engage the lower arm 14 of the; first: or Jrearmostselector lever, the remainingffivemarkingcams "extending spirally around theldrumiin a clockwise direction, look ing at the rightend ofi the caml drum. The

spacing cams are the series; having the number: one'f'cam placed. on' the'u'pper side of the drum Just toithe right Ofiithe stop arm iFigu're 1). ;3;:The'se1ecting levers will be rocked either clock;

For counterclockwise the cam drum re- 'v'olves; depending upon whether "the cam drum isis'hifted to the right in' response to a spacing signal so as to cause the spaci'ng cam mime up with the spacing arm, or to the *left in re sponse a to a-marki'ng signal so 'as fto cause a marking cam to line.v up with one of the markin}; arms The? "selector levers are thus setiup inl succession aseachim'pulse' is receivedand they] are: held invtheir =set position by individual detents gengaging either I with the top or the front, rthereof; under; the pressure; a of detent i; r-By fwayli of "a specific exarnple supposing the code" combination representative of the fraction cieonsisting oftwo marking impul'ses, two

spacing impulses and twomarking impulses is received followingv the start impulse." The startimpulse-releases -the= cam drum for a'single revolution andithei firstcode impulse, being mark ing "moves" the selectori magnet armature 51 "to the; :markin'g1 or righthand side. As the cam drumrotates the flutter-lever willbe movedout drumiwilllbe moved into line-withthemarking arm .of the first selectingde'ver andythe camwill move gthe'leven downward. to the marking ,posi

tion;

The second irnpuls'etalsrx heing mm; the armature lever remains in the right handmarking'i'p'osition-and:the;number two-marking cam is.=brought into linelwith ith'e marking'arm of the second selector lever, causing thislever to move downward into marking position. 5 1

WI'he third impulse is spacings "Therefore; the

armatureris moved 'torthe spacing or left hand side,"=where'by theflutter lever isreleased and the "cam drum permitted to move? to -its jfront stop; by means ofithe-lever 42, so that the numher three spacingcam-J'willbe in line with the third selector lever, so as tol 'move 'thesame upwardly toxspacingpositionafi it i r'Ihe, fourth impulse also being spacing the number four selectorw lever 1 will i ,be moved up wardly. i a I Thefifth and sixthfiimpulses arekmarking.

Consequently the armature is againimoved to it's marking or right handtside, causing the fifth and sixthzmarking cams to line up insuccession with the markingarm: to. shift the same Lthe markingkposition. t.

The twotransfer? arms'w'fland -78 of vtheselect ing levers are"disposeddabove the spaceda'rms of a series i-of six: transfer levers 80 (Figure 3) carriedcon a pin 81 capable of; beingTraised'f after 31 the selection has been set tip, to rock the transfer -le' v'ers either clockwise or}; counterclockwise engagement of one of} their spaced arms with tionof the operating camfll; controlled by mech anism now towbe fd'escribed. m v

" The operating cam' 21 is secured the driven member 79 "of the ratchetw clutch-26, the driving member 81 or which isfrigidfiwith theshaft 17.

The "clutch members are normally held idisen- 3 gaged against the action of a spring 82, by a fixed arm: 83 engaginga 'cam surface *onthe annularwshoulder 84 of the driven clutch 'member 79. i 1'? 7 "The friction clutch is 'simila'r to the clutch zandlcomprises; two'iriction" disks 85,186 se cured to the shaft 17; to rotatetherewith, and

having loosely mounted therebetween the driven clutch diski87, provided with i a forwardly extending stop member 88, normally engaged bya stop arm-89 1 (Figure"5)', pivoted: on' a rod 91 and having a :U shaped extension 92 provided: with an inturned arm-'93 projecting Iunde'ruthe driven disk 31 0f the: clutch 242+ I A rollerl 94 carried by the arm 93' extendsi beneaththe "disk v31 the raised portion of the cam" normally engag ing-theroller 94 toholdithe stoparm 89:.inen gagement with thewstop memberi '88. A pin'95 carried by-'the operating 'camw21 extends into a'slot 9.6 inithe driverr clutchbdisk 87 and locks the cam andclutch'diskfori rotationtogetheri i 1 The operating cam 21 has anvinternal eccentric oam'groove 9% in whicharidesp rolleri 98 (Figure 2), carried-upon one arm:99' of a lJt-shaped lever 101.v The lever." 101 is pivotedat each end upon the rod 9lfla'ndbhas a Ll-shapedz braCket' IOZ mounted thereon; The: rpm".- 81 1 T carrying the transfer levers80 lextendslbetween the upwardly projecting arms 103, "lMtof-the: bracket 10,2.

o'Ihe operation of the-transfenmechanism is as follows. During the rotationofttheicam drum 23 and justafter 'thereception of'the fourth im pulsei of the first channel signal; the depression 105i in' the edge :of the"; driven clutch disk 31 comes opposite-the roller 94tcarried byathelilever 92, permittingvthe lever to be mocked outwardly by the spring e 106fiso as: to movelith'e stop arm 89 out of engagement with the stop member 88,"thus permitting the clutohdiskfi lziof the clutch 27-to rotate, carrying with it'themoperating cam 21; After the operating 'eamis rotated a fewidegrees; the ratchet clutchx26 is brought'linto engagement by movement. ofithe cam-face of the collar 84' away from the arm 83, whereupon the operating cam isvpositiveIySdriVen-nearly to theehd of its revolution, 2 atg which point i the: ratchet clutch is againidisengaged an'clthe operating cam again stoppedrb'y engagement oil the stop member 88 with' the's'topiiarm 89.:

As, .the .roperating foam revolves it rocks the notched disks 109mounteclgon atsleeve llli'sur roundingthe type wheel shaft 15fi The disksilOQ are therefore shifted to .=the"v right-Lor to i the left (Figure 3) by the transfer levers-andsin so moving align one 'row 'of i'notches it inythe disks; The

disks aresurroundedxby aniannular row of stop bars 112 urged towards; the disk's aby individual springs 1'13. The -:faces of the notches in fthe disks 109fjare-L inclined Js'o .thatas ithe"disks-shift onestop'barwill be :cam'med out of position and another one permitted'i to 'drop into the aligned notches One of the stopi barsis thus positioned stop bar.

inthe pathof; a type-wheel stoparm 114; "carried -by,---the.- type: wheel shaft 515;. The shaft 15; as stated; is driven throughofriction clutch slfiz'sso that upon the camming (out .of one stop bar" the shaft immediately. starts into, rotation, being stopped by contact with. the newly positioned 'A' ty pefwheel 115 ;iscarried on the Shaft 15'. r1. .1 i; sPrintingtisefiected from the. type Wheel {onto a: tape :116. by .a hammer 1'17 operatedxby. an =ex+ ternal cam face on operating cam 21 through mechanism not'shown; andthe tape is advanced one character following each printing :operation I by feed rollers. 118 also-operated by cam 219- lowingtthealastselection the stop arm 33. will be brought ihtocontact with; the end 68 of: the auxiliary or. false stop -lever.-64, as shown,in Figure 8, thereby-bringing the selector cam-.23 to rest inv advance of its normal: restposition- .(detrmined. by the fixed stop 35) At this-time cam 157,?Whi0hit will .be recalled rotatesathalf the :speed of cam23, will have completed .approximately half :a revolution and the cam-projection 63 thereof --wi11= be atthe .top' of its revolution.

. ;:-:.*The1.B channel "signals are received imme diately' following the A channelsignals, that is,

without #the intervention of any synchronizing cam. .drum 23 to be. moved to the lleft so as to bring the. stop arm 33 into the path .of the fixed stop 35; This i causesthe cam'drum to come at rest as itcompletes its revolutionpremaining sta-e 'tionary until' the succeeding :start impulse. is re;

' signals .butwill i not respond to the second 'or: 3

channel signals. The mechanism is arrested in advance OffitS normalrest position duringthe receptionqof :B'. channel signals. and. is not .permitted to complete itsrevolution until after the last selecting impulse of the B channel signals has been received. Therefore it: cannotbe improperly-released by a spacing condition" oc curring .i'n-theB channel signals. t I QiReferencewiH'now be had toFigures 9-and 10 which'showgthe' construction of the channel cone trolling mechanism for thexB-channel printer. This printer responds tothe' second or-B channel signals but not;to: the;A-'channelsignals. The cam extension 63fi 0f cam. 57." ispositioned difierently relative to the stop lug 60: in the B channel a printer;. beingyoifset slightly to the. left: thereof as shown in-Figure-Q, and the auxiliary. stop. arm 64; isshortenedso that the end 68 thereof .ter-.

' ,minatesrto .the=le.ft of the normal rest position-of mam-76s .channelsignala'the. cam 31 is released for rotation as withthe'A. channel; printer, tripping the camf5'7 for one revolution. :Immediately. thereafter, however, .the-stop armi33 engages the end 168;:-.of atheEi-false. stoparm 64' bringing the cam drum 23' to;-rest-, as shown in Figure 10,-. This occursmicefore .-the cam drum reaches the first selecting position; The drum .23 is held at. rest during-the; entire period of .reception of the A channel-signals.- During this period the cam .57 makesrhalfyatrevolution bringing the projection '63.; into.contact with the stop. arm 64' and trip- .pi-ng,,-i;the.fsameiust: prior to the first impulse ofthe ;B,,.-channel signals; --.The stop arm 33 is thus-releasedpermitting.the cam drum '23 to complete; its revolution in synchronism with the B channelsignals- These; signals :operate the selecting mechanism: as. described with: reference .to'.;the A channel printer, and.atthe -propertime inzthe cycle; thev operatingcams 21 is released to effect the transfer and printing operationsgs" fiTheftiming of the operation of the and B channel .printersis shown in Figure 1 1. With the brush of .the transmitting distributor on its rest -segmentaR, the selecting cams of both printers coma torest at the point A, remaining at .rest. until a start impulse. is transmitted during which :time. both ,selector cams are' releasedesimultaneously' at the. point" B. .The? B channel selector .cam almost immediately comes to. rest atpoint? C against its false stop.. The channel-selector cam continues :to rotate during the transmission of the first six impulses; At thegendof the fourth impulse or. at'thebe ginning. of the.- fif-th .impulse, that is, at point D,; th,e A printer releases its operating cam 21 and? near. the, end of the sixth impulse of the Aachannel-signals, that-is: at point'E, in the chart the. A channel selector: cam is brought to rest against its false stop. At this time or slightly-inadvance thereof (at point *F) the" B channelselector .cam is released fromits false stop and permitted'to make a revolution. Printing is effected by.,the-A channel printer during reception -.of the Bqchannel signals. At-about the end of the fourthimpulse of .the B channel signals-,s at point. G, the operating cam of the B: channel-printerds released and towards the end of the sixth impulse, atpoint H, the'selectin'g camof the A channelprinter is'released from its-.falsestop; both'cams. coming to rest against the fixed or. normal stop 35; at. the point .A; during-therestperiod.

A system for transmitting start-stop multichanneltsig'nals for the operation of the A and B:.channels-printers'is shown in Figure 12. Two transmitters marked A channel transmitter and; .B :channeltransmitter, respectively," are shown: Eachtransmitter: has a set'of contacts 1""to fiadapted to be operated in"code-combinationsunderithe control of a perforated tape'T. Tape steppingfmagnets 121 and 121. are pro--' vided for the A and B channel transmitters respectively. "Each transmitter has anzauto controlarm 122 and- 122'. ridingin a loopof tape and controlling the contacts '123, l24xand 123;-124.".r. 'The 1' to 6 contacts of the A cha'nnel printerare connected; :.-to. segments 1"to -6 "of the transmitting rings. 125,. of -the distributor; TD and'thepcontacts"1i to; 6-of the-B channel printer are connected-.110segments-Into 1210i rings 125. The transmitting ringsgareialso pro-1 vided with a. rest'segmentRconnected to-mark.-,

ing or. negative battery and. a start'segmentfi connected to positive'..0rv spacing battery. -1..The. solid ring is connected to a line which passes. at the distant station, in series, through the selecting magnets 52 of theA and B channel printers.

A brush B1. engagestthe rings l25 s and1 adapted to be held at rest on the. rest-segment. R by a latch 126, controlled byastop. magnet] I 127.. The windingof magnet 12'! isconnected in parallel through thei'fcontacts 123 and 123 g of the A and B channel auto-control arms and ,15* I thence to battery.

Contacts, V1 to 6, of the' A channel operate 'between -amarking bus bar- 123 having.

markin battery directly; applied thereto; and a spacing bus bar 129; normally connected .to spacing battery through the tongue 131 and spacing contact s of a differential, relay 132.;

The relay 132 has one terminal connected. to; the auto-control arm. 122 and the. opposite, terminal connected through back contact 13 3.

of the relay and conductor 1341tothe A segment oflocal rings 135.1. Similarlythe spacing bus bar 129-of the B channel. printer is connected, to the tongue .131; of relay. 132.,2the left terrni nal of this relay being connected through its.

back ,contact. 133.. and. conductor 136 to: the B: 1 segment of ringswl35. The contacts writand B segments of the local rings. N

The operation r thetratnsmitter is a r61;

12* are connected respectively to. the A and.

. lows. .Assuming the brushfBl to'bepnsegrnent;

R i with. a code combination set upon the 1 con tacts the .A channel 'transmitter and; with each of the auto-control contacts ,123 and 1275f closed magnet .12? .will be; continuously, e n j 4o ergized and latch 126 withdrawn from the. path.

of. the. brush B1. "I-fhebrush 131 then passes directly. from the rest segmentqonto segment S transmitting a spacing .or start. impulse to line; followed by the. six selecting inipulses set upon the first six segments-thereon; .During the.

transmission of the A channel signals, .asloeal brush B2 engages segment 3, fan. impulse is supplied equally through the opposed windings. of relay "132' to the tape a stepping n magnet 121.

. of theB channel transmitter, setting up anew.

combination thereon; and hence on;.the .,seg.-

' ments 7 to 12 of rings 125. Consequently as thebrushBl continues. across. segrnentsfilv to '12,; a

second character :c de combination will .-.be.

(iii

1 transmitted. During this time the. A; channel transmitter is stepped as brush B2 engages'local segment A. This operationcontinues as. long as both transmitters are. supplied with .;tape.;..

i If one. transmitter, f or instance the transmitter, uses up its tape supply;causing contacts: 123 and. 124 1305 013811, current. from. the-local A segment passes through thaleft winding. only; of relay 132, .unbalancing the same and causing its tongues 131,136 and 137 to; operate thereby. (1) connecting markingbatteryto the spacing bus bar 129,1 (2). opening-contact 133 togintereffective to operate the printer as'is well lr nown by, .thosetbversed. in .therart. the. suprlyi or, tape to theaB channel transmitterlalso becomes "exhausted;contactsi;123' will also open, thus interrupting the.circuit to the startymagnetlzl and. releasin irthe. latch. 126 i for. movement; into. the path 'of the brushBl which is thus. brought to-rest onzsegment R. 1 Tha distributor remains: at rest until either. one. or theother of the transmittersvis againisuppliedjwith tape. l v

.ay'lit will be noted that an arrangement has been provided in which either. the A or .B printers may betloperated separately,- by. supplying tape to one. only ofg-thetransmitters or. both-may be. operated? during.- each revolutions-of. thedistributor, by supplylng -tapeto both transmitters. :1 rm-Figure we have shown. a modification in which the; timingcam 57 of both the. AandB channel printers; is eliminateduand :the channel control; is .eifected entirely by. the selectingcams. In-,, this modification; the cam 23A. of the 'A channel printer. has. six amarking cams 36M showmirrlsolidcolor) distributed over approxi-. mately. one-halfthe circumference thereof; and sixispacing cams 36S: arranged 180 therefrom. In herest po's-ition oi .the icam drum; the mini-- her... 1 markingland spacing cams' are adjacent the marking -;and. spacing arms 74.1. and 73,'- respectively, of the selecting levers 71.1. The cam drum .is releasedvbmthe istartt impulse sand: is eared to make time revolution during the recep tionot both-then and B. channel'signalsr Bur.

in the receptionofatheh channel signals; the

marking andspattine; cams revolve. past their marking and- ;spacine arms being shifted axially to; select the levers... F11 in accordance with the combination being; received: During :the. reception of l the 23 channel signals. the marking. cams rotate p'ast the spacing arms and them-spacing I cams rotate past the marking. arms; Since each set creams .is ofiset relative. was arms. they do not overatemthe s lecting. lever. The a cam.- disk 73143118841383 drape-portion 105 disposed: anproximately between the fourthand Jfiithmarb. inseam, so that the; lever -93 tripped-just after. the. fourth: impulse has. been received. to thereby: release the operating and: transfer cam 21.. 2

In the B chaimelprintemthe iconstructionis. exactly; the same with the. exception that. the

camdrum 23B; and the learn disk 312B is shifted approximately 180? re1ative-t0 -theistop arm "33.; r Ccnsequent1y,..idurins the; reception moi the. A; i f i channel-signals. themarkinafcams 86M or the. vB channel printersrotate" idly past. zthe spacing a ms 73 otthe, selecting .leveriand the spacing cams 36S rotate idlypast the marking armsfm;

The numbers. marking cam is not, brought onpositeynthe-gmarking arm of the-firstselecting l v rwunt ct fi s impulse .or lathe. Bmchannel sisnals is received. During. the reception of the; B1,. channel signals ehowever, the. marking and pacin c ms. are broughttsuccessively :past the corresponding arms of the. levers 1 "i1 to .selectivelw operatei the same. .Therefore, .the x B channel printerselects only the'5B tchannel signals and =the Achannel printer selectsonly the channeljsisn lsa i The modification shown in L Figures; 1 to while less simple in construction than that. of Figure .13; is preferable since-it permits of greater angular spacing of the selecting camsantielixm inates the operation oi thesflutter cam and the cam-.drum when. signals are being received over.

t e,oppositachannel...

Injorderwtb: reduce lthis idle attest r the spe'ctively, off. each printer, :duringoperation of theother printer." The contact's -of each printer are open=whenthe cams 23A and 23B are at rest so' that ea'ch selecting magnetresponds to the rest and starting impulses as well-as its channel intelligence impulses-to insure :the cams being in proper phase-relationfiwith the received Signals: 'Immediately' on release ofthe cam 23B of the B I channel printer,- a card 1413 rotating.

with the cam :drum 23B en'gages contacts" 140B- t'omclose the same, shunting out the selecting magnet-523 50 that it :does not'respond" to the A channel sigrl alss c'ontacts' 1 40A of the'A channel-printer "remain open, however,--during reception of theA channel signals, being closed by a' corresponding-cam 141A after the last im-' pulseof the A channel signals has been received to thereby sh'unt out the magnet 52A; At the same time the cam =141-B permits contacts 14013 to open and conditions the magn'et- 5 23 to respondto' the B'channel signalsi Obviously thesame shunting arrangement can -made in the. channel controlling-mechanism of the printers. -While wehaveshown the channel controlling mechanismsxas applied to a par-- ticular' form of printerf it is to -be understood that they areaeq'ually adaptableto-other types of printers," and ther-efore we dounot desire to be limited" to the s particular details shown and" describedu i What-We claimisr I i w 1. In "a telegraph system, a source of signals comprising a plurality of"char'actercode groups of .impulses preceded by-a singlestart impulse and followed by a-single re'st impulse, aplurality of single magnet 'start-stop printers and channelling means'inc'orporated in each of said print ers for :causing" operation of a separate printer for eachof said groups "of impulses:

2i In a telegraph system a source of signals comprising :a. plurality of characte'r code groups of. impulses preceded by a single start impulse" andzfollowed by a single rest-impulse; a plurality of start-"stop printers and channelling means in dividual to eachprinter 'forcausing "operation of each printer inrespons'e'i to an individual group" of impulses of the plurality.--

I I =3. Ina telegraph system, a line circuit,"aplurality-of-printers connected serially in said circuit," a: source of signals arranged to I transmit over said circuit a plurality of; character code groups; of impulses and a single start impulse common to, said plurality of groups of impulses" and means forcausing said printers to operate in. succession: on successivegroups-of impulses.

541 111" a telegraph system,'a source of signals comprising-a plurality of character 'code groups of impulses having a single-synchronizing im-- pulse 1 common thereto, aprintersubject to all off said signals a'nd means for rendering said printer unresponsive to all but one of said groups ofiimpulsesw v 5'. A telegraph 'printer comprising a printing mechanism; a selecting mechanism, a start-stop device controlling said selecting mechanism, means'controlled by the 'startimpulsefof a sucother transmittingarrangements g 986,768 cam" drum '33,} we ihavezprovided-a" pair ofcom; tact MOA and lfljOB which=shunt-out th'e windings of the selecting-magnets 52A'an'd' 52B re-' cession *of signal impulses for releasing said start-stop device and means for-delaying-vtheoperation of said selector mechanism until a"pre-"- determined number of said signalimpulses have been received. .7 I 6. A printer for operation on' a multi-channel telegraph system comprisinga printing mechanism and a selecting mechanism, and means in-i dividual to said printer for rendering said selecting mechanism-responsive 'to the signals of its individual channel only. a V 1 Y I w 7. A printer for operation on amulti-channl telegraph system comprising aprinting mechanism, -a selecting mechanism, a channelling" mechanism, said channelling mechanism being entirely mechanical and serving to render said selecting mechanismresponsive to signals re-" ceived-over a predetermined channel only. 8. In a telegraph printer,- a selecting mechanism, an electro-magneticallycontrolleddevice therefor, means for operating said electro-mags netic device 'in'response to a successionof re-" ceived character code signals and means-for op erating'said selecting device in 'accordance'with only one of said character code signals.

9, In a telegraph system, a source of signals of impulses, a printing mechanism, a selecting magnet, a selecting mechanism;start-stopj cam' means for operating'said selecting-mechanism under the control of said selecting magnet", said start-stop cam means having a normal rest'pof sition, means for releasingsaid camfrom'sa'id position in respon'se to the start impulse, means for rotating said cam means in synchron'ismwith one group of character code selecting impulses only and means for arresting said cam means in an oif-normalposition during the 'receptiomofthe remaining character code groups of selectingllsIn a telegraph printer for a-multi-channel system using signals comprising a-start impulse followed by a plurality of character code groups of selecting impulsesand'a rest impulse, a selecting cam means having a normal rest position-, meansffor releasing said cam means from said rest 'position'inre'sponse to the start impulse and for bringing the same to rest in said'normal'position-durihg the rest impulse,- selectingmecha'- nism cooperating with said cam means during the reception of a single'character group "of impulses and printing means controlled by "said' selecting means. A 12; In a telegraph printer' for a multi chan'nel' system using signals comprising "a start impulse followed by a plurality of character codegroups of selecting impulses and a rest impulse, a shaft normally at rest, means'responsive to said start impulse for releasing saidshaft for a cycle of operation extending over the periodof reception of said pluralityof character code groups of im-'- pulses, a selecting mechanism normally at rest and means controlled by said shaft for releasing" in hits cycle for releasingzsaid selectingimecha-i transmitting" distributoniaitplurality ofmtape V n 40 I anism, when operated, to apply a uniforin line I i condition to the corresponding contacts ct the tively responsive to individual code groups f nism.

operation and .means operated by saidvb channel from itspcorresponding transmitter .11 only; 1.

allotisaid tape controlledmechanism for in rrupting theroperation of said'distributor' means for each printer in said common ime;

means for ftransmittingra vpluralityaofz groups of signals over .i said linefsini continuous.successionv and a selecting mechanism for each printer, operablerf over i a predetermined cycle,ri;under1 the; control of-saidelectromagnetic means, said se- I lecting mechanism acting to shunt-out saidlelectromagnetic me'ans durin a portion of: said cycle. :c-e': a? E1121; Inia telegraphzsystem arisourcet of; signals comprisingr'ampainoflcharacter code group'sivofs impulses,;said pair heingJpreceded by: a singlestart impulseuand followed byfla lsingle rest pulse, a pair of start-stop printers controlled;

directly by.said"start:andurestfimpnlses one of saidtprinters operating on thELfiI'ShgIOHPflf im pulses a i and: the 1 other printer: operating on 1 the secon'dgrotipof impulsessw err 22In a telegraph system, a source of signals-z comprising-aplurality of character code groups of impulses transmitted: in continuous successioni and a single start l impulse itherefor, aw plurality of printers reach subj'ect to?" all of :said signals and means for causing saidprinters to operate in succession on! successive groupstof impulses; r235: Im a telegraphsystem; a :source of signals, comprising a plurality ofcharacterfcodei groups Said'LseIecting mechanism for movementrduring theperiod of reception. of a single charactencodez groupof selecting impulses trif r .a rim 0 913. In a; telegraph? printer, apowerlishaft, ya selecting mechanism and a channel controlling mechanism "separately; driven lbw-said power shaft, signal control; means f or ir.eleasing "said; channel controlling mechanism for: t a cycle: i of.

ling control mechanism, at an intermediate? point 101% nism foroperation. 1;; vi 14. 111 aQmulti-channeLtelegraph system, a plurality of litransmitters, a printer :rcorrespond iiig to each: transmitter; means for transmitting a a character codezgroup of impulses inss-uccession from each transmitter and controlmeansaindividual to eachzprin'ter'ior' causingitsgasscciatedi printer to respond to the signals transmitted' 5:15. In i av multiachannel: telegraph" system, a

transmitters therefor, operable in succession; means for operating saidu distributor as longas any i on said'. transmitters is supplied with-tape: and; means :for ,stopping said; distributor when the itape supply to; each of said: transmitters is of impulses having a a single. synchronizing .imexhausted. MIL- 1: l e1 pulse 'common thereto; a printer subject to :all 511416 -In ia multi-channel: start-stop telegraph ofhs aid "signals and *means:controlledi by saidsystem; Y a" transmitting distributor having asynchronizing impulse iorgrendering said'printer; starting contact'andia plurality of groups of responsive vtothe first group ofyimpulses' 'and ocde fcontacts, a: transmitter associated with each means :forrendering' the"tprinter 'unresponsive 5toi group of code contacts, said transmittersbeing thersucceedingegroups 0f impulses; operable in succession to -set iip signal combina- 1 24 In: avtele'graph system; a) source ofsignals tionsonsaid code contactstvcher'eby -a start im= comprising a p'air'of 'characten -codegroups of pulse' i-followedwby' a plurality oi 'cliaracterflcocie impulsesvhaving a single synchronizing impulse groupsiof impulsesyis transmitted during each common thereto, acrprinter subjeotitoboth of; cycleaofi operation-of the distributor, a tape 'con' said groups of impulses and means for rendertrolled cmechani'sm for je'ach jtransmitt'er 'and ing said printer operable in accordance-with the meansrcontrolldbyreach tape-controlledmech-w secondionly'sofzsaid groups o'ttimpulses. p

25. :Aprhiter'for operation-'on a multi-channel telegraplr' 'ssistern comprising a printing "mechanismpa channelling :mechariism and 'a selecting mechanism; 1? said channelling mechanism being i 1 entirely mechanical and "serving to render said selecting lmechanism responsivet) signals-"re ceived overwa predetermined channel onlin- 26:Af: printerpzforks-operation on a multichannel telegraph system comprising a: print ing mechanism'g j'a channelling mechanism 1 and; a: selecting meehanism; said channelling mechanismw being entirely mechanical in operation: and serving to render said selecting mechanism responsive'fato signalsreceived overa predetermined channel only anet start-stop means; for maintaining said channelling mechanism in" synchronisin with-thereceivedsigrialss- "2 7; Afpririter for operationbver' a multi channel telegraph-system"compifising a printing mechanism, a fselectir ig'i mechanism, "electr c? magnetic neans respondin'gjto signals received over a cam raman. ren r gqsa ti 1 select g mechanism "responsive ,to operations? ro' inagne eanslroinly inaccordu s areq i e o apre erm ned;

distributor and means-actuated by operation ii 17; In six-telegraph system; asource *of 's gnal's comprising a plurality of character cocle groups of: impulses transmittedi'n continuous successicm; a plurality of printers subject to--said sig nals a' controli impulsecommon "to 'fisaid plurality of groups -'of impulses and means cont'rolled by said control impulse for rendering said printers selec impulses. i it '13. Gina telegraph system,-a source of signal s comprising a plurality of character code "groups'= of impulses transmitted in continuous succession, a pluralityflof -.printers;. selecting' mechanism therefor and aidistributor individual tozlea chz printer, associated with said selecting meeha-x for selectively distributing-g said groups-10f pdei s toisa as oci d se ect n m ch e n 1 4 ei biee dfijarh litrfb a printers, a common line, asingle selecting mag;

1 14% mement (sw rm it O er. a: i i a channel telegraph system comprising a printing mechanism,;a selecting =mechanism, said electromagneticrmeans responding to s nalsr received overall channels and channelling mechanism; maintainedvin synchronism ,withrrsaid received signals for renderingsaid selectingfimechanisr'n responsive to operations of said; =eIectro'-mag-- 7s;

mined one o signals. i i t I -20. combinationf'a plur'ali' of teleg p printers, a common line; electromagnetic controlf Ti) v followed by a plurality ofcharacter. code groups neticmean's I-in accor'd'ance with signals-received over-a predetermined: channel only. i

-:29.6Inr. a telegraph sys'tem;:-ai'source of telegraph signals Icomprising a. plurality of character code groups .of impulses received-in. con-' tinuous' succession; a; printer .having a single selecting magnet responsive to all of :said signal impulses, a selecting mechanism for said printer comprising a plurality of character code groups.

of impulses. received. in::continuous succession, a plurality of receiving printers each receiving all .of said-signal impulses, axselec'ting mechanism foreach printer, including selecting cam means normally. iatrest' and-means operable in synchronism-with; said. received signals for releasing. thewcamfmeans r.of,.-each printer for a cycle ,of operationvasi: each. group ofimpulses, is received-whereby each printer responds to a single-character code grouponly of the plurality.

.31.-In.a telegraph system, a source of signals comprising aplurality; of character code groups of. impulses received .in continuousv succession, a receiving printer corresponding to each of said groups of impulses, each printer having a single selecting magnet'responsive to all of said signal impulses; a selecting mechanism for each printer normally at restiandmeans :operable in synchronism withrsaidfreceived signals for starting the selectingvmeohanismi-of each printer into operation at.=-the-beeinning.of its corresponding groupv of impulses, andmeans for stopping each selecting mechanismnat the..-end of said group of impulses.

32. In a-telegraph system, arsourcefoi tele-..

render. the: selecting mechanism of each printer operable. in succession, 1- as successive groups of impulses are received. v v l 33. -In a telegraphprinter for a multi-channel system; using .signalscomprising a start impulse of impulses, ..a -printing mechanism, aselecting magnet, a selecting mechanism, start-stop cam meansfor operating said selecting mechanism under the control of said selecting magnet, said startrstop cam' mean's having a normal rest position, means forreleasing said cam from said position in response tofthe start impulse, means for rotating said cam means in synchronism with thefirst characte'rbdde group'pf impulses and meansfor arresting'sai'd cani'meansin advance of said normal rest position during the reception of the remaining character codegroups of impulses. I

'34. In a telegraph printer for a multi-channel systemusing signals comprising a start impulse.- followecl'byv :a plurality of character code groups of.'. impulses, a printing mechanism,-a

selecting magnet," aselecting mechanism, startstoppcam means.- for. operating, said :selecting mechanism under the "control of said selecting magnet, saidistart-stop cam means. having'a normal rest position, means for releasing said.

cam from said .position. in response to 1 the start impulse, meansv for arrestingsaid cam means second group of character code impulses. $5. m a telegraph printer for a multi-channe system using signals comprising a start-impulse; followed by a plurality of characterfcode. groups of selecting impulses and a rest impulse, a selectingcam means, a normal stop device therefor and an off-normal stop device,: means controlled by said start impulse for releasingsaid selecting .cam means from said normal stop device and. channelling means for releasing said select-.

ing cam means" from said off-normal stop device, said latter stop device serving to;limit the select ingmovement of the cammeans to a period of reception of a single character. code group of.

impulses.

means for maintainingeach: of said printersin synchronism with, said .signal impulses-and meansior restricting, the. operation of .each

printer. to the signals originating at its-.corre-i sponding transmitter.

37. In a telegraph system, a source of signals.

comprising a plurality of character code groups of impulses transmitted-in continuous succession, a plurality of printersya single selecting. magnet for each printer, selecting mechanism; therefor .anda distributor individual-tol'eachz printer associated with saidselecting mechanism and controlled by said selecting magnetfor se-v lectively distributing said groups of.=-code;im-y

pulses to the associated selecting mechanism.

. 38.:Ina telegraph system, a source of signals comprising a plurality of .code groups; of hue;

pulses transmitted. in 1 continuous succession, a printer, selecting mechanism therefor, "a single magnet for controlling said selecting mechanism.

and means controlled by said magnetfor rendering said selecting mechanism responsive to-pre-,- determined but notall of said groups of im-- pulses.

39. Ina telegraph printer, :a selectinginichanism operating in predetermined cycles, signal responsive means forv controlling the operation of said selecting mechanism and printing mechanism controlled by said selecting mechanism, said selecting mechanism performing its selecting;

function over only approximately half of said cycles 1 40'. In a telegraph printer, a selecting mechanism, operable in predetermined cycles, a single selecting magnet for controlling the operation of said selecting mechanism, printing mechanism controlledjby said selecting mechanism, said se-- lectingmechanism performing its selecting func-" 41. In a telegraph system, a plurality of print-.

ersassociated with .a-common line, means for transmitting groups of I signals; to said printers; in succession andmeans individual .to eachprinter;

'for causing the same to respond only to signals transmitted thereto. g

42. In a telegraph system, a plurality of print ers associated with a common line, meansffor transmitting groups of signals to said printers in succession and a selecting cam for each printer operable over a complete cycle in thetime of transmission of signals to all printers'the selecting cam of each printer performing its selecting function only overthe portionof its cycle corresponding to the periodofreception of the sigmon line, means for transmitting a pluralityof nals transmitted thereto.

43. In combination a plurality of telegraph printers, a common line, a single electromagnetic' control means for each printer in said comgroups of signals over said line in continuous succession and means for. rendering said electromagnetic means alternately effective and ineffective to respond to said signals, whereby each printer responds to different ones of said groups of impulses.

44. In combination, a plurality of telegraph printers, a common line, electromagnetic control means for each printer in said common line, means for transmitting a plurality of groups of signals oversaid line in continuous succession and means operating in synchronism with said.

signals for shunting out the electromagnetic control mean of each printer in succession, whereby each of said printers responds only to predetermined-groups ofkimpulses. i

telegraph 45.'In a telegraph system, a pair of printers, a selecting mechanism for'each printer operating over: a predetermined cycle, means for transmitting character code groups of "impulses graph signals comprising 'a plurality of character} code groupsof impulses received in' continuous succession; a plurality of receiving printers; each receiving all of said signal impulses, a selecting mechanism for each of said printers and signals for conditioning the selecting mechanism of each printer only, during the reception of a single group of impulses which is individual to said printer.

47. In a telegraph system, a signalling line, a

meansoperable in synchronism with the received source of signals therefor comprising a plurality of codegroups of, impulses transmitted in continuous succession, a plurality of receiving printers, eachhaving a single selecting magnet normally in said line, a selecting mechanism for each printer and means operable in synchronism with said received signals for rendering the 'selecting mechanism of each printer operable in succession, whereby each printer is operated accordance with only one code group of impulses.

' ROBERT F. DIRKES.

ROLLINS, WENTWORTH. 

